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  1. local translators = {}
  2.  
  3. local function translate(expr)
  4. 	return translators[expr.expr_type](expr)
  5. end
  6.  
  7. function translators.var(expr)
  8. 	return expr.name
  9. end
  10.  
  11. function translators.abs(expr)
  12. 	local param = expr.param
  13. 	local body = translate(expr.body)
  14. 	return "function(" .. param .. ")\nreturn " .. body .. "\nend"
  15. end
  16.  
  17. function translators.app(expr)
  18. 	local fn = translate(expr.fn)
  19. 	local arg = translate(expr.arg)
  20. 	return "(" .. fn .. ")(" .. arg .. ")"
  21. end
  22.  
  23. function translators.str(expr)
  24. 	return string.format("%q", expr.value)
  25. end
  26.  
  27. local expr = {
  28. 	expr_type = "app",
  29. 	fn = {
  30. 		expr_type = "abs",
  31. 		param = "x",
  32. 		body = { expr_type = "var", name = "x" },
  33. 	},
  34. 	arg = { expr_type = "str", value = "Hello, world!" },
  35. }
  36.  
  37. print(translate(expr))
  38.  
Success #stdin #stdout 0s 2832KB
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Standard input is empty
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(function(x)
return x
end)("Hello, world!")
https://ideone.com/Jr6Toi
language:
Lua (luac 5.3.3)
created:
10 years ago
visibility:
secret

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